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प्रश्न
Tick (√) the correct alternative from the choice given for the following statement
A pop sound is heard when a lighted match stick is brought near the mouth of a jar. This indicates the release of gas.
पर्याय
oxygen
hydrogen
nitrogen
water-vapour
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उत्तर
hydrogen
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संबंधित प्रश्न
Tick the most appropriate answer.
5. Photosynthesis requires
- heat energy.
- wind energy
- sunlight.
- sound energy
Write true or false for the statement
Decomposition of leaves is a fast change.
What are reversible and irreversible changes ? Give one example for each.
Tick (√) the correct alternative from the choice given for the following statement.
A substance which can not sublime is
Write true or false
Decomposition of leaves is a fast change.
Classify the following as a physical or a chemical change.
Boiling of water
Change is the law of nature and occurs in our everyday life, at all times and in all places. Differentiate between the following change with a suitable example.
Desirable and undesirable change.
Select the chemical changes from the following list of changes
Butter turning rancid
State whether the following statement is true or false:
Stretching of rubber bands is not a physical change.
Give an example to justify the statement that physical changes can be reversible as well as irreversible.
